3 Уравнения АЛГЕБРА, ОЧЕНЬ НУЖНА ОЦЕНКА

1) x^2 = t
t^2+ 3t - 10 = 0
t1 + t2 = -3
t1*t2 = -10
t1 = -5
t2 = 2
x^2 = -10
Нет решений
x^2 = 2
x1 = V2
x2 = -V2

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2) 4x^3 - 36x^2 +81x = 0
x(4x^2 - 36x + 81) = 0
x1 = 0
4x^2 - 36x + 81 = 0
D = 1296 - 1296 = 0
x2 = 36/8 = 4,5

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3) x^3 - x^2 - 81x + 81 = 0
x^2(x - 1) - 81(x-1) = 0
(x^2 - 81)(x - 1) = 0
(x-9)(x+9)(x-1) = 0
x1 = 9
x2 = -9
x3 = 1

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4) (x^2 - 2x)^2 - 2(x^2 - 2x) - 3 = 0
(x^2 - 2x) = t
t^2 - 2t - 3 = 0
t1 + t2 = 2
t1*t2 = -3
t1 = 3
t2 = -1
x^2 - 2x = 3
x^2 - 2x - 3 = 0
x1 = 3
x2 = -1
x^2 - 2x = -1
x^2 - 2x + 1 = 0
D = 4 - 4 = 0
x3 = 1

садись, 2

Номер 2.

4x³- 36x²+81x=0
х(4х²-36х+81)=0
х(2х-9)²=0

х=0
х=9/2

Хз сложно